bass Dave Holland
tracks 1-1 to 1-9, 2-2, 2-3, 2-5 composed by Chick Corea
cover Patrick Roques
drums Jack DeJohnette
drums, percussion Horacee Arnold
flute, piccolo flute Hubert Laws
photography by [cover and liner] Francis Wolff
piano Chick Corea
producer Sonny Lester
recorded by, mastered by Malcolm Addey
reissue producer, liner notes Michael Cuscuna
tenor saxophone Bennie Maupin
trumpet Woody Shaw
Manufactured By Unknown (LDR)
Recorded at Bell Sound, New York City on May 11, 12 and 13, 1969
Mastered at the Malcolm Addey Studio, New York City
Cover and liner photographs © Mosaic Images

Note: The alternate take of Sundance was transferred from an LP; no tape source could be found.

1-1, 1-3, 2-1, 2-3 were on the original Is, released in 1969 on Solid State Records, 1-2, 1-4, 1-5 and 2-2, recorded at the same sessions were released three years later as Sundance on Groove Merchant. The rest are alternate takes, never released before. Bennie maupin was not credited on the original release of Is.
Matrix / Runout: LDR 2625